Leases - Schedule of Quantitative Information on the Partnership's Lease Population (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Lessee Disclosure [Abstract]
Lease expense	$ 37,782	$ 31,889
Other information:
Cash payments for operating leases	37,919	32,306
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 40,043	$ 35,817
Weighted-average remaining lease term	6 years 2 months 12 days	6 years 6 months
Weighted-average discount rate	5.10%	5.30%